Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
Mar. 29, 2019	Sep. 28, 2018
Goodwill:
Goodwill, beginning balance	$ 5,684
Currency translation and other	(58)
Goodwill, ending balance	5,626
Transportation Solutions
Goodwill:
Goodwill, beginning balance	1,993
Currency translation and other	(14)
Goodwill, ending balance	1,979
Accumulated impairment losses	2,191	$ 2,191
Industrial Solutions
Goodwill:
Goodwill, beginning balance	3,104
Currency translation and other	(39)
Goodwill, ending balance	3,065
Accumulated impairment losses	669	669
Communications Solutions
Goodwill:
Goodwill, beginning balance	587
Currency translation and other	(5)
Goodwill, ending balance	582
Accumulated impairment losses	$ 489	$ 489

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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-Section 45
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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
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-Publisher FASB
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- Definition

Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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